157661265 has 16 divisors (see below), whose sum is σ = 257626368. Its totient is φ = 82296576.

The previous prime is 157661201. The next prime is 157661291. The reversal of 157661265 is 562166751.

It is not a de Polignac number, because 157661265 - 2⁶ = 157661201 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 111112 + ... + 112521.

It is an arithmetic number, because the mean of its divisors is an integer number (16101648).

Almost surely, 2^157661265 is an apocalyptic number.

157661265 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

157661265 is a deficient number, since it is larger than the sum of its proper divisors (99965103).

157661265 is a wasteful number, since it uses less digits than its factorization.

157661265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223688.

The product of its digits is 75600, while the sum is 39.

The square root of 157661265 is about 12556.3237056075. The cubic root of 157661265 is about 540.2254031572.

The spelling of 157661265 in words is "one hundred fifty-seven million, six hundred sixty-one thousand, two hundred sixty-five".